if you can put some test data of the TABLE, and the output format and criteria it will be easier for us to give some suggestions.
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Oracle query performance
Hi there - hope someone is able to help.
Previously someone was kind enough to write me a query. Oracle 10 db.
( background - http://www.experts-exchang
Basically the query ( see below ) is taking far too long to run and I was looking for suggestions to improve the performance of this.
i.e. is there a more efficient way to achieve the same results.
note - this needs to be a query, I'm not able to create temporary tables etc to achieve this.
Neither am I able to create indexes etc. to help with this.
SQL ;
SELECT * FROM
(SELECT
MIN(DECODE(ACC_CODE,91,SAL
DECODE(ACC_CODE,92,DELIVER
FROM TABLE)
WHERE DELIVERY_DATE IS NOT NULL
Any suggestions ?
Thank you,
d.
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Answers
Hi,
Explain plan ( via TOAD )
SELECT STATEMENT Optimizer=ALL_ROWS (Cost=76979 Card=11171690 Bytes=346322390)
SORT (GROUP BY) (Cost=76979 Card=11171690 Bytes=346322390)
VIEW (Cost=60061 Card=11171690 Bytes=346322390)
WINDOW (SORT) (Cost=60061 Card=11171690 Bytes=368665770)
PARTITION RANGE (ALL)
TABLE ACCESS (FULL) OF MASTER_TABLE (Cost=26346 Card=11171690 Bytes=368665770)
Example data can be viewed on previous post ( link above ). The only index on this table is on Processing_date which is not referenced ( nor relevant as a limit to this query ).
d.
One option could be
SELECT * FROM
(select min(decode(ACC_CODE,91,SAL
decode(ACC_CODE,92,DELIVER
from TABLE
where ACC_CODE in (91,92))
WHERE DELIVERY_DATE IS NOT NULL
If ACC_CODE is indexed, then you should get a table access by index, rather than a full table scan or if the table is partitioned by ACC_CODE then you should get only the required partitions being scanned
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by: gatorvipPosted on 2007-07-09 at 09:29:48ID: 19446519
What does your explain plan say? What indexes do you have? What is "far too long"?